11h20 Try to restart the accelerator. Start-up modulator, laser, fridge, chillers

Problem, with all magnets control All DS are in FAULT state. Help is needed.

It is solved.

MPS prevents klystron output power from turning on. Probably due to the closed FP valve.

15h45 ThomX was stopped.

08h35 Start-up modulator (it was already on standby), laser, magnets, cycling.

As yesterday there is a problem with the MPS to start the machine. We are trying to investigate whether it is related to the vacuum or something else.

Problem with the solenoid COL.01 (Internal Interlock Hard).

Help is needed.

At this moment, apparently we are blocked by the closed vacuum valve of the FPC. To be checked with Nourredine (emails sent).

The vaccum level in the FPC is not yet good to open the valve. Eric will check it.

10h10 Switched to the Linac+TL+EL configuration. HV is on (the modulator was in the local mode). Interlocks even at HV 1200 V, the sect att. 3 dB. Linac 04 vac is high.  

10h33 There are breakdowns at 26 dB the section att. and 25 dB of the RF gun att. These are not in vacuum breakdowns. Probably it is the klystron problem.

10h50 The modulator is in the standby mode.

Maher is coming to check the klystron and Jean-Noel is working on the solenoid power supplies.

11h40 Maher fixed problem with the klystron by increasing the filament power. At 84 kV, I = 48.7 A (microperveance 2.0). At 293 kV, I = 294 A (microperveance 1.85, should be 2.0).

12h03 The machine configuration without FP closes the photocathode laser shuter, so we can operate only in the Linac+TL+EL configuration.

12h36 Energy = 50 MeV, Laser Phase 25 dg., Sect. Phase 253 dg., Sect. Att. 2.26 dB, I_Gun -95.0704 pC, I_Linac -92.7397 pC, I_TL -3.7568 pC RF_Ampl. 0 kV, RF_Phase 35.5 dg.

Laser Att. 360, Linac steerers H: [0.31 -2.62], V: [-1.87 2.88]

12h43 Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.35 dB, I_Gun -101.3924 pC, I_Linac -99.5194 pC, I_TL -101.3812 pC RF_Ampl. 0 kV, RF_Phase 35.5 dg. 

13h17 Laser Att. 410 (max) Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.35 dB, I_Gun -138.8712 pC, I_Linac -135.3968 pC, I_TL -137.4172 pC RF_Ampl. 0 kV, RF_Phase 35.5 dg.

At the moment maximum charge is 135 pC with irise Ø of 1.3 mm  (possibly because the laser photocathode shutter is in the wrong position)

13h25 The modulator is in standby mode. Maher can remove the MPS short.

The problem with MPS is the OC/AVAL02 FP valve. It is in two states at the same time: Closed and Open.

It was the OC/AVAL01 FP valve

recipe_recipe_LI_TL_RI_all_20260422_18_34_34.txt loaded

14h54 Beam is in the ring w/o RF. Thank you all !!!!.

15h15 Laser Att. 360,  Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.42 dB, I_Gun -179.1795 pC, I_Linac -205.8011 pC, I_TL -186.6367 pC RF_Ampl. 99.1184 kV, RF_Phase -50 dg.

Laser Att. set to 320 for 100 pC

15h25 Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.33 dB, I_Gun -96.7941 pC, I_Linac -124.7882 pC, I_TL -102.9734 pC RF_Ampl. 99.1184 kV, RF_Phase -50 dg.
 

15h28 recipe_recipe_LI_TL_RI_all_20260121_10_35_05.txt loaded. There is storage, but it is necessary to optimize it

15h33 ring_saving

15h35 recipe_recipe_LI_TL_RI_all_20260422_18_34_34.txt loaded

15h36 ring_saving

17h41 ThomX was stopped

07h35 Start-up modulator (does not go to standby), laser, magnets, cycling.

9h50 HT ON

~10h30 Electricity cut

14h Restart of all the machine...

Almost all systems were restarted, except for the photocathode laser.

17h40 ThomX was stopped

07h50 Start ThomX

09h20 HV is 'ON'

09h25 HV  1215 V

09h52 RF Gun phase 234 dg. Att. 0.0 dB, Charge -110.0 pC; Sect. phase 208 dg., Att. 2.566 dB, TL/BPM2 X +2 mm

10h00 injection to the ring TL/BPM2 X -2 mm

10h02 Ring RF 100 kV

Today compared to yesterday shift the synchrotron oscillation amplitude is very unstable. Phase ? To be investigated.

First beam imaging with the MRSV.

 BBA studies

Horizontal plane

BPM3 (BPM.04-Lib.03) dX=1.1 mm

BPM9 (BPM.04-Lib.05) dX=0.8 mm

BPM5 (BPM.06-Lib.04) dX=0.2 mm

BPM11 (BPM.06-Lib.05) dX=-0.3 mm

BPM4 (BPM.05-Lib.04) dX=-0.3 mm

BPM10 (BPM.05-Lib.05) dX=1.2 mm

Set offsets on X in Liberas (OffX)

BPM.01-Lib.03, 130000+1800000 = 1930000

BPM.02-Lib.03, 70000+400000 = 470000

BPM.04-Lib.03, 40000+1100000 = 1140000

BPM.06-Lib.04, 30000+200000 = 230000

BPM.03-Lib.03, 60000+100000 = 160000

BPM.05-Lib.04, 130000-300000 = -170000

BPM.01-Lib.04, 300000+400000 = 700000

BPM.02-Lib.04, 70000+200000 =  270000

BPM.05-Lib.05, 140000+1200000 = 1340000

BPM.06-Lib.05, -20000-300000 = -320000

BPM.04-Lib.04, -50000+800000 = 750000

BPM.03-Lib.03, 60000+100000 = 160000

Vertical plane

BPM12 ri-c1/dg/bpm.01-lib.03 dY =  -2.4 mm

BPM1 ri-c1/dg/bpm.02-lib.03 dY = - 0.1 mm

BPM2 ri-c1/dg/bpm.03-lib.03 dY = - 0.5 mm

BPM3 ri-c1/dg/bpm.04-lib.03 dY = -0.2 mm

BPM4 ri-c1/dg/bpm.05-lib.04 dY = -1.0 mm

BPM5 ri-c1/dg/bpm.06-lib.04 dY = - 0.7 mm

BPM6 ri-c2/dg/bpm.01-lib.04 dY = - 1 mm

BPM7 ri-c2/dg/bpm.02-lib.04 dY = - 0.1 mm

BPM8 ri-c2/dg/bpm.03-lib.05 dY = -0.3 mm

BPM9 ri-c2/dg/bpm.04-lib.05 dY = -0.6 mm

BPM10 ri-c2/dg/bpm.05-lib.05 dY = + 0.3 mm

BPM11 ri-c2/dg/bpm.06-lib.05 dY = +0.5 mm

Set offsets on Y in Liberas (OffY)

BPM12 ri-c1/dg/bpm.01-lib.03 dY_new  = -300000 -2.4 mm  = -2700000

BPM1 ri-c1/dg/bpm.02-lib.03 dY_new = - 10000 - 0.1 mm = -110000

BPM2 ri-c1/dg/bpm.03-lib.03 dY_new = 105000 - 0.5 mm = -395000

BPM3 ri-c1/dg/bpm.04-lib.03 dY_new = 190000 -0.2 mm = -10000

BPM4 ri-c1/dg/bpm.05-lib.04 dY_new = - 110000  -1.0 mm =  -1110000

BPM5 ri-c1/dg/bpm.06-lib.04 dY_new = -100000 - 0.7 mm = -800000

BPM6 ri-c2/dg/bpm.01-lib.04 dY_new = -20000 - 1 mm = -980000

BPM7 ri-c2/dg/bpm.02-lib.04 dY_new = 150000 - 0.1 mm = 50000

BPM8 ri-c2/dg/bpm.03-lib.05 dY_new = 0 - 0.3 mm = -300000

BPM9 ri-c2/dg/bpm.04-lib.05 dY_new = - 90000 -0.6 mm =  -690000

BPM10 ri-c2/dg/bpm.05-lib.05 dY_new = 70000 + 0.3 mm =  370000

BPM11 ri-c2/dg/bpm.06-lib.05 dY_new = 10000 +0.5 mm = 510000

Studies in single trigget mode. See screenshots.

Beam is stored (sligth decay) in the ring around 15 minutes without touching anything. This opens way for beam dynamics studies and for better understanding of machine. Need to find a way to have diagnostics data  (trigger only diag) in such mode.

17h50 Stop ThomX

08h35 Start ThomX: Modulator, Frigo, All magnets.

08h40 Cicling all magnets, Start Chillers 

10h00 HV is 'On'

Modulator Interlocks at HV=1215V

10h25 HV=1215 V

Rec. from 20241219 18:14

Linac Steerers: H [2.38 -4.16],  V [-1.70 2.15]

RF Gun Phase is 199.0 dg., RF Gun Att. is 0 dB, (Dark Current is 18 mV, too low), Sect. Att. 2.53 dB, Sect. Phase is 221 dg.

Charges: -106 pC, -107 pC, -116 pC

10h50 Beam is injected to the ring

Trying the LOCO

12h35 Modulator Interlocks at HV=1215V, Went to 1200 V. Did not help even at 1000V (Maher's intervention needed).

13h00 This is the problem with triggering. When triggered internally, the modulator is working.

13h07 OK at HV=1215 V (Unknown reason). Nikolas said miss triggering is less than 5%

13h20 Linac frequency was changed a little bit to diminish miss triggering

18h00 Stop ThomX

08h25 Start ThomX: Modulator, Frigo, cycling all magnets

08h30 Start chillers

10h00 HV is 'On'

10h25 RF Gun Phase is 193 dg., Sect. Att. is 2.46 dB, Phase is 218 dg. Charges:  -98 pC, -105 pC, -106 pC

Linac steerers: H [2.38 -4.16], V [-1.8 2.15]

Ring injection. After cycling Ri-C1 QP5 is out of order, fixed

10h30 Beam is in the ring, Rec. from 20250109_17_23, TL/BPM02 X=+3 mm

11h00 setings for ring without sextupoles for LOCO

11h04 setings for ring without sextupoles for LOCO (Matlab config file) is saved

The same with sextupoles.

Trying LOCO with sextupoles: LOCO inprove results on storage and tune. Tune changed from 0.15 to 0.17

13h30 HV is 'Off'.  Controled access to the bunker.

13h55 HV is 'On'

/tmp_mnt/data/shared/commissioning_scripts/MatLab/pilotage/libera_calctunesS_ThomxOperateur.m  to measure tune from operateut.thomx account

16h55 Stop ThomX

8h50 Start of the modumator and all subsystems

PC client 1 was frozen => we restarted

10h20 HV on 1215 V

RF gun phase 28 dg., Att. 0.0 dB, Charge -106 pC

The beam shape at screen TL/DG/SST.01 is very strange. Big change. Try to allign the QP1 QP3

Steerers: H [2.48 -4.46]; V [-1.86 2.29]

Section Att. 2.77 dB, Phase 208,  TL/BPM2 X= 0.1

11h45 Ring injection. Ri-c2/ps/str.06-h.01 and   Ri-c2/ps/str.06-v.01 tango servers were off

12h59 Measure Beem energy with TL Steerer: 53.2 MeV (screenshot), TL/BPPM2 X about zero.

12h53 Start ring RF

14h0 Section chiller 'off' (unknown reason), Energy start to drop . Switch to 'on'.

15h27 Modulator on Standby

16h30 HV on.

16h37 Modulator 'off' voluntary. Unknown reason.

17h55 HV 'on' 1215 V, Section Phase 217, -125 pC

18h30 'access controle' to install shunt resistances of 33 Ohm at four magnets (close placed).

18h55 HV 'on' 1215 V, Section Phase 217, -125 pC

Orbit at straight sections goes down on 2 mm.

19h13 Stop ThomX

11h05 Start ThomX

11h50 BPM02-Libera04 wiring has been checked: 'OK' 

12h20 HV is 'ON' 1215 V

12h31 RF Gun phase is 179 dg.

12h48 RF Gun phase is 181 dg. Sect. Att. 2.534 dB, Phase is 213 dg. Linac Steerers H [2.98 -4.66], V [-1.8 2.15]

14h50 HV on Standby. Controlled access

15h20 HV is 'ON'

17h50 Reajust linac transport: linac steerers H [2.38 -4.18], V [-1.9 2.05]  Charge -121 pC, -114 pC, -123 pC

18h55 Stop ThomX

8h50 Start of the modumator and all subsystems

Beam studies.

Orbit Correction.

Transport only with dipoles -  turn at 161.4A

Frequency from 500.0853 change to 500.0913

Tries BBA

16h12 Problem with sudden change of params.

Recepies did nopt store corrected orbit: due to erro in EL steerer.

In continuation to yesterday study Jean Noel soldered in parallel 33 ohm : effect on orbit visible . Need to find correct shunt resistance (temperature) and power > 10 W.

Power supply does not show any sign of problem.

18.40 End of shift

8h55: mise en chauffe (modulateur, frigo/chillers, laser, cyclage)

10h20 HV ON

Start with the receipt nominal.  problem with the RF gun laser camera. Solved.

Going to the new receipt for Isol = 242 A

Tuning injection. Good storage.

We performed sveral scans with FPC. The measured vert beam siwe is about 82 um. The best X-ray fluc I3+I4 was about 30-40 kpA.

The size at MRSv hor/vert is about 15/19 pixels

Starting from a certain moment, the trig to trig injection stability changed. See the screenshot. This to be understood.

Going to nominal receipt. After the tuning of the injection, the good storage is obtained. Size at MRSV 15/24 pixels

measurements of the dispersion and LOCO studies. First without sextupoles and later with. To be continued.

Going back to new receipt Isol = 242 A. Storage is bad. Retuning of the TL and injeciton. Good storage is obtained with good tunes 0.17/0.7.

Studies with X-rays will be continued tomorrow.

dispersion and beta function measurement as tunes are seems to be quite stable

Switching on the streak camera.

Phases during the day:

RF Gun: 296; 229; 242

RF section: 218; 209; 218

02/06/2026

~15h30 Starting all system

16h Start up of the modulator, laser, magnets

Problem with the shutter, it is in the orange state. 

Goal: Vertical orbit and angle at the IP with I3 and I4 X-ray signals

8h55 Switch ON the modulator and all the machine

Camera SST2 : impossible de changer le temps d'expo    and SST3 not started

• Phase max Q = 333° with Q = 130 pC
• Phase Sec : 203°  and Att = 2.46 dB
• Aligned quads

With the previously saved receipt, the injection and charge of the stored beam was quite bad. We tried several receipts. We tried to tune the ring till ~16h.

The FPC was operated in synchronous mode with the power twice less as typical value.

The TL transport was different from previously used. We should try to keep the same orbit in the TL for reproducibility. 

The FPC scan showed the two peaks structure => to be understood.

Then, we re-loaded the lattice from folder Reference (changed the laser position @photocathode). With the energy-phase adjustments we arrived to the resonable conditions. The FPC scan is attached.

Both I3 and I4 were recorded/displayed during the shift. In this configuraiton, the X-ray signal was mainly maximized and I3 ~7k-8k pA (I4~ a few hundreds of pA).

The vertical orbit was modifief to have zero angle at the IP. See the plot attached. 

In this configuraiton, the X-ray signal was almost equally shared between I3 and I4 ~ 1k pA.

A proper conditions and FoM should be defined for further optimization procedures. 

18h15 STOP THOMX

I have decresed the Imax to 8 A and loaded the new cycling curves

RI-C1/PS/QP.06 and RI-C2/PS/QP.02: normally cycling  with Imax 8 A , finish without error => PS to be checked for Imax >8 A (nominal 10 A

08h56 Warm-up ThomX: Modulator, Laser, Fridge
Chillers were started, cycling all magnets.
Low SF6 pressure.

10h20 HV ON

Tuning of the Linac. Charge at ICT1 is about 100 pC

Load the nominal receipt.

Modulator put to stand by. Lunch break.

13h16 HV ON

Application of the quadrupol calibration curve -12..12 A.

NEW

K1i_model =

   -1.5941
   -1.5941
   -1.5941
   -1.5941

K2i_model =

    3.2615
    3.2615
    3.2615
    3.2615

K3i_model =

   -6.1107
   -6.1107
   -6.1107
   -6.1107

K4i_model =

    5.4292
    5.4292
    5.4292
    5.4292

K5i_model =

   -3.5901
   -3.5901
   -3.5901
   -3.5901

K6i_model =

    2.3630
    2.3630
    2.3630
    2.3630

>> 
OLD
K1i_model =

   -1.5473
   -1.5473
   -1.5473
   -1.5473

K2i_model =

    3.1987
    3.1987
    3.1987
    3.1987

K3i_model =

   -6.0302
   -6.0302
   -6.0302
   -6.0302

K4i_model =

    5.3524
    5.3524
    5.3524
    5.3524

K5i_model =

   -3.5248
   -3.5248
   -3.5248
   -3.5248

K6i_model =

    2.3082
    2.3082
    2.3082
    2.3082

Machine-Model studies.

Nominal receipt

Before LOCO
=== dQ/dx comparison (axis: delta (dk*steps)) ===
Family    dQx/dx(M)      dQx/dx(T)      ratio     dQy/dx(M)      dQy/dx(T)      ratio
QP1     +4.975e-01  +5.370e-01   0.927   -3.362e-01  -4.067e-01   0.826
QP2     +7.289e-01  +8.119e-01   0.898   -2.407e-01  -2.830e-01   0.851
QP3     +2.198e-01  +2.420e-01   0.908   -9.850e-01  -6.102e-01   1.614
QP4     +1.026e+00  +1.136e+00   0.903   -2.736e-01  -2.968e-01   0.922
QP31    +6.600e-02  +7.543e-02   0.875   -2.357e+00  -1.288e+00   1.830
QP41    +5.350e-01  +6.000e-01   0.892   -1.024e+00  -5.563e-01   1.841

LOCO studies.

Checked that the first turn on which we inject now is 13-14th.

18h20 STOP THOMX

9h40: mise en chauffe (chillers/frigo, modulateur, cyclage)

HV ON

The ICT signal (GUN) is frozen. Need help to restart it. Use the BPM SpSum instead.

13h Beam in the ring.

RF gun phase 31 dg., Sect. att. 2.47 dB, Sect. phase 237 dg., charges (ICT): about -120 pC

17h16 ThomX stopped

10h30 : mise en chauffe  (frigo/chillers, modulateur, laser, cyclage)

All rondes are broken, THOMX key is turned. What is the reason of this intervention?,  There is nobody around. Jean-Noel came and helped to solve the problems.

Help is needed to set up everythiing (rondes sous-sol, PSS....) and tune the photocathode laser.

Listes des Ds pour les températures des chillers

• GUN : ER/HF/RAC.17-API.AI1/AI2
• Section : ER/HF/RAC.17-API.AI1/AI1

Emplacements :

• Sortie Chiller : AI1 en Volt
• Sortie Clarinette : AI2 en °C
• PT100 Structure : AI3 en °C

Conditionnement du canon 

Niveaux de vide pendant le conditionnement : 

• toujours le vide 1, à l'avant du Canon qui domine 
• Pas de claquages aux valeurs de puissance atteintes, environ 150 kW
• Vide / sécurité : Les pompes ioniques ont été mises en local afin de mettre le seuil d'interlock à 10E-7 mBar 
  • les interlocks n'ont pas fonctionné
  • pour que les interlock fonctionnent, il faut se mettre en reseau profibus, mais le seuil passe alors à 5E-6 mBar.  
• Le vide (Jauges) a toujours une structure temporelle de periode 2 min environ 
  • Le RGA a été démarré en soirée pour Lundi
  • Un boitier jauge a été mis en place dans la casemate pour comprendre la structure temporelle des signaux de vide (en trouver la cause) 
• Côté CC : 
  • pour éviter des soucis avec les modifications des valeurs des atténuations, le changement de la valeur pourra se faire par les fleches par valeur de 0.5 dB

QP3 scan

vary Soleno
Iris 1mm ATT 400 (150 pC)

Mesures du jour : 

• Quad scans à QP1 pour voir d'autres points de fonctionnement avec une matcihing anneau correct (Figure de merite <1 ?)
  • autres points Solé
  • autres points Q > 100pC (jusqu'à 300pC)  
• Active learning pour données TL jusqu'à TLSST3 inclus.  

Attenuation laser : 320 pour pour avoir 100 pC @ Emax

Alignement Quads + minimisation disp E ok 
 14h40 : Laser s'est arreté ... le Ds s'est mis en fault --> soucis de liquide de refroidissement
--> intervention de kevin 

 18h04: plus de trig (Synchro? ) --> trigger ne clignotte plus 

18h20 : Stop ThomX